PREMIUM HEADGEAR & FOREHEAD PAD The ComfortGel Blue Na-sal's redesigned forehead pad reduces pressure points for a more comfortable experience; and premium headgear m-ak-es fitting and adjustment a snap and helps maintain a proper seal. Together, these features create a higher level of comfort and stability than was previously possible. LOWER PROFILE EXHALATION PORTS : The ComfortGel Blue Na-sal's lower micro-exhalation ports with an integrated swivel that quietly directs air flow up and away from the ma-k wearer and bed partners. BLUE GEL TECHNOLOGY The ComfortGel Blue Na-sa-l's new generation, soft, pliable blue gel cushion readily adapts to facial features, simplifying fit and contributing to extended comfort. A Sure Seal Technology (SST) Flap provides a membrane-thin layer over the gel cushion to improve seal and make cleaning the ma--sk quick and easy. Building on the global success of the original ComfortGel Na-sal Ma-sk,it combined the best qualities of their time-proven gel ma-sks with several highly regarded enhancements to establish a whole new level of ma-sk performance with the ComfortGel BLUE.